Business analysts develop Excel spreadsheets to assist with the day-to-day operational decisions their jobs demand. Pleased with the autonomy and sophisticated analysis that Excel supports, they share these innovations with colleagues who modify spreadsheet logic and manually tack on data from their own information silos. Over time, rogue spreadsheets with data from dubious sources are propagated throughout the organization. Executives find themselves making decisions based on untraceable, questionable data. The enterprise is at a loss to audit these numbers for themselves and for regulatory agencies.